Ribbon mechanism for type-writers.



G. W. DAVIS. RIBBON MECHANISM FOR TYPE WRITERS.

APPLICATION FILED M0229, 1911 L i' Y Patented ont. 2?, w14.

-bar'jextend as at 19 at right4 angles to its vThe extreme ends of the bar are widened and formed with slots 16 extending parallel lto the'sides of the frame to afford a connection for pawl supporting inenibe'rs to be also presently further alluded to. 'lhis carrier has a pair of slides 20 mounted thereon and slidably connected thereto by headed pins 2 projecting through longitudinal slots 22 in the slides near each end thereof and fixed in the carrier, the adjacent ends of the slides having oppositely facing hooks 23 struck out of the plates from which the slides are formed and .bent upwardly at right angles thereto. .il retractile helical spring 24 connects the hooks together and the opposite ends of the slides have integral downwalicllyv offset lateral dogs 25 projectingtoward the platen. The edges of these slides having the dogs are also formed with.

a pair of standards 2G engaged by the for* wardly forked arnis 27 of a pair of ribbon guides 28. These forked ends are" offset and disposed to, when under either normal feed or reversing conditions, lie substantially in the arcs described bythe standards in the movement of the carrier when shifted, thus making the carrier free to more to either position without disturb' if" the ribbon gaides or changing their poelen relathfely to 'the ribbon. The middle portions of these guides are formed to stand vertically and present perforated lugs whicl with the arnis 27 clasp the frame and in wl 'ch and in perforations 30 in the arms are engaged the ends of' pivot pins 9G loosely seated in the frame and suspeneed in position by en largements resting on the lugs. The riblioiigniding arms pif/mer i ,i nally .rearwardly from iid/lle of the voi tical portions 3l, and ne rilnite with the particular relative ari-ang ent of the parts thereof to the equilibrium of 'these members and the transmission, with rninirnnin resistance, if the movement of the ribbon end to the respective slide.

The dog-rocker bar 5() has mount-HV4 rigidly thereon a pair ol upright arms l, having a pair of forwardly projecting .spaced lingers 52 in positions to clear the dogs under normal ribbon-feeding conditions and on each writing action so operate as to in tersect the plane in which the dogs 'are adapted to slide, ont `ivithort engfalf' ig the dogs unless shi lted and held in shifted position.

orEhe carrier is vieldingly held in either working position by a latch in theforrn of i an' angular lever 55 fulcriimed at the end of. to the machine frame and havingl one arm its other arm cut to present a pair 'of faces 56 and 57 disposed 1n acute angular relation presented respectively to the faces of an angular projection 58 upon the carrier-bar. A spring 59 yeldingly retains the latch in working position. ticular angular arrangement of the .faces of the latch is to cause the carrier end to exert a glancing pressure thereon and thus secure slight frictional resistance which requires to be very light for the purpose.

'lh'e feed-pawl rocker frame 9 consists of a plate or thin flat bar ont to U-form with f its legs 60 bent at right angles to its crossbars and fulcruined at about the middle to the ends 8 of the bracket 6. The upper ends of the arms are straddled by and have pivotally connected thereto a pair of split blocks 61, the forward ends of which areB vertically perforated to afford journals for the inner ends of a 'pair of ribbon-drum actuating pawls G2 projecting through the arches of the frame in which their sliding oscillatory movements are accommodated.

These blocks provide joints accommodating motion of Ithe pawls intwo directions, the motion in one direction being on the pivotal connection of the blocks to the legs 60, and the motion in the other direction being on the pivot of the pawl in the block. The

outer ends of the pawls are guided in the supporting members before mentioned. This rocker-frame is actuated synchronously with cach action of the writing inechanisinby a link connecting the saine to the dog rocker bar 5l). These pawl supporting ineinbcrs consist of angle-plates connected by screws Tl through the slots lo in the ends' ol the carrier 2 and threaded into the ineinbers, the outer edges of the ends establishing the proper tangential position of these meinbers with relation to the ribbon spools and slots permitting proper angular adjnstnient in ass sibling the machine. rEhe upper por tiene el these angleplates have inclined slots T5 in which the `lree ends of the pawls lio with a tendency, due to gravitation, to remain at the lower ends of the slots `and conscmicntly at a point, with the members properly adjusted, at which they obtain niost effective engagement -with the ribbon spool ratchet wheels. The upper ends of these angle-plates carry the ribbon spool re taining pawls El() which are comparatively wide and ystruck from a plate with luOs 8l bent at right angles and pivoted on a pin 82` n'nninted in lugs 83 struck up from the angleplate and set diagonally to impart vto the pawlsa tendency, due also to gravitation, to lie in contact with the ratchet wheels., Upwardly extending bent back lugs S6 upon@ the pawls imparting to them theproperties'- of latches and the operating. ends of thelSO The object of the par' Work eouseciby the ioss oi.

1 defective the friction vices 'oi reminding the rotmnoii of the ribbon' spools sind the consequent :feeding ci? more 1U-ribbon than necessary to the ribbon guide This is obviet'ecl by the particular conetruc tion ofA the friction devices each consisting of o resilient thin Het sheet metal her 95 bowed' as shown in lFig. 3 am; having lugs .5 96 adopted to engage slots 97 in 'the iioor oi the ribbon-spool cese 98 while e, pair of di verging lugs 99 et eech side of efch of the lugs 96 bear on the floor and yieidingy sus tain the bars 95 in rictionzil engagement ggy with the spools. nWith this conetructi each friction device must be sprung to be set in place or removed and is self retaining when in position.

Operation: Each e/ction of the writing z5 mechanism as usual operates the dogrocl bar 50, and consequently the ro .ii'er-irfiine the pawls and the particular ribbon engaged; and the arms 5i with the 1 y *s 52 are simultaneously operated. ifi-h o the so ribbon is almost ell fed from one spo l to the other and an enlargement upon the ribbon engages the particular ribben guide at that side of the machines the eiiile 2() 'te which that ribbon-guide is connected is displaced und the dog thereon engaged by one of the fingers 525 the eii'ect being that P the carrier 2 is swung-j on its pivot cnil the pnwls G2 shifted from oiie'spool to the o xr. lt is to be noted that it is not necessary for 40 the ribbon to .mov-e more than ribbon guide the dog 25 in operative rei in there-v with and the intermediary portsT hich constitute an individuati mechanism offering minimum resistance to the ribbonu liihen the ribbon has not displaced either ribbongni'de and the operator inadvertently wvee one of them when writingis not bei it will be returned to nominal poem the spring 24 immediately the opel lenses it, thus obviating the more quent reuse of one port of the ribbon than another and in consequence securing uniform weer ',theieof.. What I claim is asvffillows 1. The combinatioiI with apart movable in unison with each Writing action of the mw chine, and ribbon feeding fievices of means for reversing the action ot' thelatter comprisn ing a, pair of members located at opposite t0 sides of the printing point and upon by the ribbon when it nears the ends bf its travel in either direction, inepencleiitly operating individuel mechanisms operetiveiy connected to the respective members, such tf1-.mechanism being normally stationery relel. L in tion with Wril oleic in infie-on with. line' machen@ ribbon guides located :it oppof chine, of :s pivotcll member swport @ovvie vi-ith one pnvfi one of the spots en agement,

ie v 5' the solici 'im tiimugh *l senil ribbon actuated (levieet Y of shifting one of the. pziwls i it with one of Spool".

en gli gement i: in t type'wiit' nation with ribbon ieel, end means incinl', the salici spools ribbon actua ing h 1 .cvicee the pmvis, ioclepeii nisms op ath ribbon its ends means operated by the writing mechanism for operating the said bar through the me# dium of the said ribbon actuated mecha nisms for the vpurpose of shifting one of the pawls into engagement with one of the spools and the other pawl out of engagement with the other spool.

6. In a typewriting machine the combination with a part operated by the `vvristing mechanism, ribbon spools, and means, including aWls, for actuating the spools individual y, of a pair of ribbon actuated members, a horizontally rocking bar having devices at its ends 'for guiding the pawls, independently operating mechanisms carried by the bar at opposite sides of its pivot and adapted to in certain positions coact with the said first mentioned part in roch-- ing the bar, means operatively connecting the respective members to the said mechav nisms to shift the same.

7. ln a typewriting machine the combina tion with a dogerocker, ribbon spools, a pair of pawls for operatingthe spools, and means for vibrating the pawls, of a horizon tally rocking bar having guiding devices at its ends in which the awls are supported in operative relation with one or the other spool according to the position of the bar, a pair of relatively movable slides mounted upon the bar and each having a lateral dog, means yieldingly retaining the slides in normal position, a pair of arms upon the dogroclrer and constructed and disposed to engage either. lateral dog when the slide bearmg the latter is shifted from normal csie tion a pair of relatively displaceable ri bon guides, means operatively connecting. the

ribbon guides to the slides.

8. in a typewriting machine the combination with a dog-rocker, ribbon spools, a pair of pawls for operating the spools, and means for vibrating the pawls, of a horizontally rocking bar having guiding devices at its ends in which the Jpawls are supported. in operative relation with one or the other spool according to the positionlof the bar, a pair of relatively movable slides mounted upon the bar and each having a standard and a lateral dog, mea-ns yieldingly retaina pair o arms upon the dog-rocker and constructed and disposed to engage either lateral dog- When the slide bearing thelatter is shifted from normal position, a pair of relatively displaceable ribbon guides having arms with forked arms projecting in lines coincident With arcs described by the rockerbar and engaging the standards.

9.111. a typewriting machine the combi,

nation with a dog-rocker, ribbon spools, a pair of pawls for operating the spools, and means for vibrating the parvis, of a horizontally rocking bar having guiding devices at in which the pawls are supported .diderent positions consis y finger yieldlngly mounted and having bear l in operative relation with one or the other spool according to the position of the han a pair of relatively movablel slides inoimted upon the bar and each having a lateral dog, means for limiting the movement slides2 a retractile helical spring connecting the slides together, a pair of arms npon the dog rocker and constructed engage either lateral do bearing the latter is shifted from normal' position, a `pair y ribbon guides, means operatively connecting the ribbon guides to the slides, l

l0. ln a typewriting machine the combi nation with ribbon feed. and talreup spools, and means including pavvls for actuating 'the said spools individually, 'of a pairoi actuated devices, a llcrieontally recirbar devices at its ends gnidjng he pawls, bar in its dilerent positions, means. opera tively connecting the ribbon actuamd de icesv to the bar, and means operated-hy the writing mechanism for operating the said bar through the medium of the said ribbon actuated devices for the purpose and disposed to Ashifting the parvis and Ireversing the action of the feed devices Y 1l, In atypewriting machine the combin nation with a dog-rocher, ribbon spools, a

pair of pavvls for operating the spoolsI and means for vibrating `the paivls, of a horizontally rocking har having guiding devices at .its ends in which the pavvls are supported in operative relation with one or the other spool according to the position ofthe bar, means for yieldingly retaining the rocking bar Ain its different positions, a pair of relatively movable slides mounted upon bar and each having a lateral dog, means yiell ingly retaining the slides in normal position, a pair of arms upon the dog-reicher and con structed and disposed to engage either lateral dog when the slide bearing the .latter is shifted from normal position, a pair of relatively displaceable ribbon guides, means operatively connecting the 'ribbon guides to the slides.

l2. ln a typewriting machine the combination with a dog-rocker, ribbon spools, a pair-of pawls for operating the spools, and means for vibrating the pawls, of a horizonn tally rocking bar having its ends in which the pau'ls are supported in; operative relation with one or the other spool according to the position of the bar, means of thel when the slidev of relatively displaeeable' eev ice

guiding devices at yieldingly retaining the irocking bar in i ing of an angular arms upon the dog# rocker and constructed Vand disposed to enl secured across the said arches; yangular 28 ulcrunied to the quadrantal frame and pawlsupporting and guiding plates 70 sehavingJ Jforked arms 2( engaging the stand cured to the ends or" the bar 2 and having ards 26; arms 5l mounted rigidly upon the inclined slots 75; pawls consisting` of plates dog-rocker iior engagement with dogs 25 80 with lugs 86 `fulcrumed diagonally yto when the slides are shifted and provided 45 the plates 7 O; 'slides 20 upon the bar 2 and with spaced fingers 52; rocker-frame 9 with having oppositely .facing hooks 23, standlegs 60 ulcrumed between theiriends to the ards 26 and offset dogs 25; means slidably bent ends 8; link 65 connecting the lowerl connecting the sli-des to the bar; a retractile end of the rocker-frame to the dog-rocker; helical spring 24 yieldingly connecting the blocks 61 pivoted to the upper ends of the 50 hooks together; ribbon guides 28 ulcrumed legs 60; pawls 62 journaled in the blocks I tothe quadrantal frame and having forked and projecting' through the arches andll arms 27 engaging the standards 26; arms 5l through and rest-ina; in slots 7 5 for engagexnounted rigidly upon the dogg-rocker and ment lwith one or the other` of the spoolsf having spaced lingers 52 for engagement 23. in a typewriter the combination with 55 .with dogs when the slides are shifted; the ribbon-spoolcase, the spool therein and and vibratory actuating pawls projectings the pin upon which the spool rotates, of a through the slots 75 for operative conneounitary friction device between the spool tion with the spools. and door of the case and having; 'integral 22. ln a typewritinp; machine the combimeans whereby it is detachablv connected to l nation with a main frame, a quadrantal the case.`

` frame mounted thereon and having radial 24. Ima typewriter the combination with trame'bars with arches, and adog-rocker bar the ribbon-spool-case having slotsin its 50 mounted in the main frame, of ribbon door, the spool therein and the pin upon spools rotatably mounted upon the main lwhich the spool rotates, of a friction device frame; braclfet secured to the quadrantal for retarding; the rotation of the spool conframe and having arm l and bent ends 8; sisting of a bowed resilient bar with lugs bar 2 pivoted to arm 4 and having angular projected from its ends and engaging: in .ends 10; guides for the bar consisting,n of slots inthe floor and each end of the barplates 12 and 13 secured across the said having" a pair of diverging; lugs at each side '70 arches; angular pawl-supporting and ,quidof the projected lugs andfbearing upon the ing plates lsecured to the ends of the bar door.

2 vand having inclined slots 7 5; pawls oo nn testimony whereofhave signed my .sisting of plates with lugs 86 fulcrumed naine to this specification in the presence of diagfnally to te 1lpiates 70; slidesi 20upon two witnesses.

the ars 2 an aving opposite y -acing j hooks 23, standards 26 and oset dogs` 25; GERGE WILLAM DAVIS' means slidablv connecting the slides to the/ "Viitnesises:` f bar; a retractile helical spring; 2li yieldinglyf E.` R. sPrrrs, connecting the hooks together; ribbon guides y GORDON G. CAKE; 

